--- /dev/null
+/*
+ * IPv6 fragment reassembly
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on: net/ipv4/ip_fragment.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Fixes:
+ * Andi Kleen Make it work with multiple hosts.
+ * More RFC compliance.
+ *
+ * Horst von Brand Add missing #include <linux/string.h>
+ * Alexey Kuznetsov SMP races, threading, cleanup.
+ * Patrick McHardy LRU queue of frag heads for evictor.
+ * Mitsuru KANDA @USAGI Register inet6_protocol{}.
+ * David Stevens and
+ * YOSHIFUJI,H. @USAGI Always remove fragment header to
+ * calculate ICV correctly.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/jiffies.h>
+#include <linux/net.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/inet_frag.h>
+#include <net/inet_ecn.h>
+
+static const char ip6_frag_cache_name[] = "ip6-frags";
+
+struct ip6frag_skb_cb {
+ struct inet6_skb_parm h;
+ int offset;
+};
+
+#define FRAG6_CB(skb) ((struct ip6frag_skb_cb *)((skb)->cb))
+
+static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
+{
+ return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
+}
+
+static struct inet_frags ip6_frags;
+
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev);
+
+/*
+ * callers should be careful not to use the hash value outside the ipfrag_lock
+ * as doing so could race with ipfrag_hash_rnd being recalculated.
+ */
+static unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
+ const struct in6_addr *daddr)
+{
+ net_get_random_once(&ip6_frags.rnd, sizeof(ip6_frags.rnd));
+ return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
+ (__force u32)id, ip6_frags.rnd);
+}
+
+static unsigned int ip6_hashfn(const struct inet_frag_queue *q)
+{
+ const struct frag_queue *fq;
+
+ fq = container_of(q, struct frag_queue, q);
+ return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr);
+}
+
+bool ip6_frag_match(const struct inet_frag_queue *q, const void *a)
+{
+ const struct frag_queue *fq;
+ const struct ip6_create_arg *arg = a;
+
+ fq = container_of(q, struct frag_queue, q);
+ return fq->id == arg->id &&
+ fq->user == arg->user &&
+ ipv6_addr_equal(&fq->saddr, arg->src) &&
+ ipv6_addr_equal(&fq->daddr, arg->dst);
+}
+EXPORT_SYMBOL(ip6_frag_match);
+
+void ip6_frag_init(struct inet_frag_queue *q, const void *a)
+{
+ struct frag_queue *fq = container_of(q, struct frag_queue, q);
+ const struct ip6_create_arg *arg = a;
+
+ fq->id = arg->id;
+ fq->user = arg->user;
+ fq->saddr = *arg->src;
+ fq->daddr = *arg->dst;
+ fq->ecn = arg->ecn;
+}
+EXPORT_SYMBOL(ip6_frag_init);
+
+void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
+ struct inet_frags *frags)
+{
+ struct net_device *dev = NULL;
+
+ spin_lock(&fq->q.lock);
+
+ if (fq->q.flags & INET_FRAG_COMPLETE)
+ goto out;
+
+ inet_frag_kill(&fq->q, frags);
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(net, fq->iif);
+ if (!dev)
+ goto out_rcu_unlock;
+
+ IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
+
+ if (fq->q.flags & INET_FRAG_EVICTED)
+ goto out_rcu_unlock;
+
+ IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
+
+ /* Don't send error if the first segment did not arrive. */
+ if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments)
+ goto out_rcu_unlock;
+
+ /* But use as source device on which LAST ARRIVED
+ * segment was received. And do not use fq->dev
+ * pointer directly, device might already disappeared.
+ */
+ fq->q.fragments->dev = dev;
+ icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
+out_rcu_unlock:
+ rcu_read_unlock();
+out:
+ spin_unlock(&fq->q.lock);
+ inet_frag_put(&fq->q, frags);
+}
+EXPORT_SYMBOL(ip6_expire_frag_queue);
+
+static void ip6_frag_expire(unsigned long data)
+{
+ struct frag_queue *fq;
+ struct net *net;
+
+ fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+ net = container_of(fq->q.net, struct net, ipv6.frags);
+
+ ip6_expire_frag_queue(net, fq, &ip6_frags);
+}
+
+static struct frag_queue *
+fq_find(struct net *net, __be32 id, const struct in6_addr *src,
+ const struct in6_addr *dst, u8 ecn)
+{
+ struct inet_frag_queue *q;
+ struct ip6_create_arg arg;
+ unsigned int hash;
+
+ arg.id = id;
+ arg.user = IP6_DEFRAG_LOCAL_DELIVER;
+ arg.src = src;
+ arg.dst = dst;
+ arg.ecn = ecn;
+
+ hash = inet6_hash_frag(id, src, dst);
+
+ q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
+ if (IS_ERR_OR_NULL(q)) {
+ inet_frag_maybe_warn_overflow(q, pr_fmt());
+ return NULL;
+ }
+ return container_of(q, struct frag_queue, q);
+}
+
+static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
+ struct frag_hdr *fhdr, int nhoff)
+{
+ struct sk_buff *prev, *next;
+ struct net_device *dev;
+ int offset, end;
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ u8 ecn;
+
+ if (fq->q.flags & INET_FRAG_COMPLETE)
+ goto err;
+
+ offset = ntohs(fhdr->frag_off) & ~0x7;
+ end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
+ ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
+
+ if ((unsigned int)end > IPV6_MAXPLEN) {
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+ ((u8 *)&fhdr->frag_off -
+ skb_network_header(skb)));
+ return -1;
+ }
+
+ ecn = ip6_frag_ecn(ipv6_hdr(skb));
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ const unsigned char *nh = skb_network_header(skb);
+ skb->csum = csum_sub(skb->csum,
+ csum_partial(nh, (u8 *)(fhdr + 1) - nh,
+ 0));
+ }
+
+ /* Is this the final fragment? */
+ if (!(fhdr->frag_off & htons(IP6_MF))) {
+ /* If we already have some bits beyond end
+ * or have different end, the segment is corrupted.
+ */
+ if (end < fq->q.len ||
+ ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
+ goto err;
+ fq->q.flags |= INET_FRAG_LAST_IN;
+ fq->q.len = end;
+ } else {
+ /* Check if the fragment is rounded to 8 bytes.
+ * Required by the RFC.
+ */
+ if (end & 0x7) {
+ /* RFC2460 says always send parameter problem in
+ * this case. -DaveM
+ */
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+ offsetof(struct ipv6hdr, payload_len));
+ return -1;
+ }
+ if (end > fq->q.len) {
+ /* Some bits beyond end -> corruption. */
+ if (fq->q.flags & INET_FRAG_LAST_IN)
+ goto err;
+ fq->q.len = end;
+ }
+ }
+
+ if (end == offset)
+ goto err;
+
+ /* Point into the IP datagram 'data' part. */
+ if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
+ goto err;
+
+ if (pskb_trim_rcsum(skb, end - offset))
+ goto err;
+
+ /* Find out which fragments are in front and at the back of us
+ * in the chain of fragments so far. We must know where to put
+ * this fragment, right?
+ */
+ prev = fq->q.fragments_tail;
+ if (!prev || FRAG6_CB(prev)->offset < offset) {
+ next = NULL;
+ goto found;
+ }
+ prev = NULL;
+ for (next = fq->q.fragments; next != NULL; next = next->next) {
+ if (FRAG6_CB(next)->offset >= offset)
+ break; /* bingo! */
+ prev = next;
+ }
+
+found:
+ /* RFC5722, Section 4, amended by Errata ID : 3089
+ * When reassembling an IPv6 datagram, if
+ * one or more its constituent fragments is determined to be an
+ * overlapping fragment, the entire datagram (and any constituent
+ * fragments) MUST be silently discarded.
+ */
+
+ /* Check for overlap with preceding fragment. */
+ if (prev &&
+ (FRAG6_CB(prev)->offset + prev->len) > offset)
+ goto discard_fq;
+
+ /* Look for overlap with succeeding segment. */
+ if (next && FRAG6_CB(next)->offset < end)
+ goto discard_fq;
+
+ FRAG6_CB(skb)->offset = offset;
+
+ /* Insert this fragment in the chain of fragments. */
+ skb->next = next;
+ if (!next)
+ fq->q.fragments_tail = skb;
+ if (prev)
+ prev->next = skb;
+ else
+ fq->q.fragments = skb;
+
+ dev = skb->dev;
+ if (dev) {
+ fq->iif = dev->ifindex;
+ skb->dev = NULL;
+ }
+ fq->q.stamp = skb->tstamp;
+ fq->q.meat += skb->len;
+ fq->ecn |= ecn;
+ add_frag_mem_limit(&fq->q, skb->truesize);
+
+ /* The first fragment.
+ * nhoffset is obtained from the first fragment, of course.
+ */
+ if (offset == 0) {
+ fq->nhoffset = nhoff;
+ fq->q.flags |= INET_FRAG_FIRST_IN;
+ }
+
+ if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
+ fq->q.meat == fq->q.len) {
+ int res;
+ unsigned long orefdst = skb->_skb_refdst;
+
+ skb->_skb_refdst = 0UL;
+ res = ip6_frag_reasm(fq, prev, dev);
+ skb->_skb_refdst = orefdst;
+ return res;
+ }
+
+ skb_dst_drop(skb);
+ return -1;
+
+discard_fq:
+ inet_frag_kill(&fq->q, &ip6_frags);
+err:
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_REASMFAILS);
+ kfree_skb(skb);
+ return -1;
+}
+
+/*
+ * Check if this packet is complete.
+ * Returns NULL on failure by any reason, and pointer
+ * to current nexthdr field in reassembled frame.
+ *
+ * It is called with locked fq, and caller must check that
+ * queue is eligible for reassembly i.e. it is not COMPLETE,
+ * the last and the first frames arrived and all the bits are here.
+ */
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev)
+{
+ struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
+ struct sk_buff *fp, *head = fq->q.fragments;
+ int payload_len;
+ unsigned int nhoff;
+ int sum_truesize;
+ u8 ecn;
+
+ inet_frag_kill(&fq->q, &ip6_frags);
+
+ ecn = ip_frag_ecn_table[fq->ecn];
+ if (unlikely(ecn == 0xff))
+ goto out_fail;
+
+ /* Make the one we just received the head. */
+ if (prev) {
+ head = prev->next;
+ fp = skb_clone(head, GFP_ATOMIC);
+
+ if (!fp)
+ goto out_oom;
+
+ fp->next = head->next;
+ if (!fp->next)
+ fq->q.fragments_tail = fp;
+ prev->next = fp;
+
+ skb_morph(head, fq->q.fragments);
+ head->next = fq->q.fragments->next;
+
+ consume_skb(fq->q.fragments);
+ fq->q.fragments = head;
+ }
+
+ WARN_ON(head == NULL);
+ WARN_ON(FRAG6_CB(head)->offset != 0);
+
+ /* Unfragmented part is taken from the first segment. */
+ payload_len = ((head->data - skb_network_header(head)) -
+ sizeof(struct ipv6hdr) + fq->q.len -
+ sizeof(struct frag_hdr));
+ if (payload_len > IPV6_MAXPLEN)
+ goto out_oversize;
+
+ /* Head of list must not be cloned. */
+ if (skb_unclone(head, GFP_ATOMIC))
+ goto out_oom;
+
+ /* If the first fragment is fragmented itself, we split
+ * it to two chunks: the first with data and paged part
+ * and the second, holding only fragments. */
+ if (skb_has_frag_list(head)) {
+ struct sk_buff *clone;
+ int i, plen = 0;
+
+ clone = alloc_skb(0, GFP_ATOMIC);
+ if (!clone)
+ goto out_oom;
+ clone->next = head->next;
+ head->next = clone;
+ skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
+ skb_frag_list_init(head);
+ for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
+ plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
+ clone->len = clone->data_len = head->data_len - plen;
+ head->data_len -= clone->len;
+ head->len -= clone->len;
+ clone->csum = 0;
+ clone->ip_summed = head->ip_summed;
+ add_frag_mem_limit(&fq->q, clone->truesize);
+ }
+
+ /* We have to remove fragment header from datagram and to relocate
+ * header in order to calculate ICV correctly. */
+ nhoff = fq->nhoffset;
+ skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
+ memmove(head->head + sizeof(struct frag_hdr), head->head,
+ (head->data - head->head) - sizeof(struct frag_hdr));
+ head->mac_header += sizeof(struct frag_hdr);
+ head->network_header += sizeof(struct frag_hdr);
+
+ skb_reset_transport_header(head);
+ skb_push(head, head->data - skb_network_header(head));
+
+ sum_truesize = head->truesize;
+ for (fp = head->next; fp;) {
+ bool headstolen;
+ int delta;
+ struct sk_buff *next = fp->next;
+
+ sum_truesize += fp->truesize;
+ if (head->ip_summed != fp->ip_summed)
+ head->ip_summed = CHECKSUM_NONE;
+ else if (head->ip_summed == CHECKSUM_COMPLETE)
+ head->csum = csum_add(head->csum, fp->csum);
+
+ if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
+ kfree_skb_partial(fp, headstolen);
+ } else {
+ if (!skb_shinfo(head)->frag_list)
+ skb_shinfo(head)->frag_list = fp;
+ head->data_len += fp->len;
+ head->len += fp->len;
+ head->truesize += fp->truesize;
+ }
+ fp = next;
+ }
+ sub_frag_mem_limit(&fq->q, sum_truesize);
+
+ head->next = NULL;
+ head->dev = dev;
+ head->tstamp = fq->q.stamp;
+ ipv6_hdr(head)->payload_len = htons(payload_len);
+ ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
+ IP6CB(head)->nhoff = nhoff;
+ IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
+
+ /* Yes, and fold redundant checksum back. 8) */
+ if (head->ip_summed == CHECKSUM_COMPLETE)
+ head->csum = csum_partial(skb_network_header(head),
+ skb_network_header_len(head),
+ head->csum);
+
+ rcu_read_lock();
+ IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
+ rcu_read_unlock();
+ fq->q.fragments = NULL;
+ fq->q.fragments_tail = NULL;
+ return 1;
+
+out_oversize:
+ net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
+ goto out_fail;
+out_oom:
+ net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
+out_fail:
+ rcu_read_lock();
+ IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
+ rcu_read_unlock();
+ return -1;
+}
+
+static int ipv6_frag_rcv(struct sk_buff *skb)
+{
+ struct frag_hdr *fhdr;
+ struct frag_queue *fq;
+ const struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct net *net = dev_net(skb_dst(skb)->dev);
+
+ if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
+ goto fail_hdr;
+
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
+
+ /* Jumbo payload inhibits frag. header */
+ if (hdr->payload_len == 0)
+ goto fail_hdr;
+
+ if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
+ sizeof(struct frag_hdr))))
+ goto fail_hdr;
+
+ hdr = ipv6_hdr(skb);
+ fhdr = (struct frag_hdr *)skb_transport_header(skb);
+
+ if (!(fhdr->frag_off & htons(0xFFF9))) {
+ /* It is not a fragmented frame */
+ skb->transport_header += sizeof(struct frag_hdr);
+ IP6_INC_STATS_BH(net,
+ ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
+
+ IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
+ IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
+ return 1;
+ }
+
+ fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
+ ip6_frag_ecn(hdr));
+ if (fq) {
+ int ret;
+
+ spin_lock(&fq->q.lock);
+
+ ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
+
+ spin_unlock(&fq->q.lock);
+ inet_frag_put(&fq->q, &ip6_frags);
+ return ret;
+ }
+
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
+ kfree_skb(skb);
+ return -1;
+
+fail_hdr:
+ IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_INHDRERRORS);
+ icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
+ return -1;
+}
+
+static const struct inet6_protocol frag_protocol = {
+ .handler = ipv6_frag_rcv,
+ .flags = INET6_PROTO_NOPOLICY,
+};
+
+#ifdef CONFIG_SYSCTL
+static int zero;
+
+static struct ctl_table ip6_frags_ns_ctl_table[] = {
+ {
+ .procname = "ip6frag_high_thresh",
+ .data = &init_net.ipv6.frags.high_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &init_net.ipv6.frags.low_thresh
+ },
+ {
+ .procname = "ip6frag_low_thresh",
+ .data = &init_net.ipv6.frags.low_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &init_net.ipv6.frags.high_thresh
+ },
+ {
+ .procname = "ip6frag_time",
+ .data = &init_net.ipv6.frags.timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+/* secret interval has been deprecated */
+static int ip6_frags_secret_interval_unused;
+static struct ctl_table ip6_frags_ctl_table[] = {
+ {
+ .procname = "ip6frag_secret_interval",
+ .data = &ip6_frags_secret_interval_unused,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
+{
+ struct ctl_table *table;
+ struct ctl_table_header *hdr;
+
+ table = ip6_frags_ns_ctl_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+
+ table[0].data = &net->ipv6.frags.high_thresh;
+ table[0].extra1 = &net->ipv6.frags.low_thresh;
+ table[0].extra2 = &init_net.ipv6.frags.high_thresh;
+ table[1].data = &net->ipv6.frags.low_thresh;
+ table[1].extra2 = &net->ipv6.frags.high_thresh;
+ table[2].data = &net->ipv6.frags.timeout;
+
+ /* Don't export sysctls to unprivileged users */
+ if (net->user_ns != &init_user_ns)
+ table[0].procname = NULL;
+ }
+
+ hdr = register_net_sysctl(net, "net/ipv6", table);
+ if (!hdr)
+ goto err_reg;
+
+ net->ipv6.sysctl.frags_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+static struct ctl_table_header *ip6_ctl_header;
+
+static int ip6_frags_sysctl_register(void)
+{
+ ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
+ ip6_frags_ctl_table);
+ return ip6_ctl_header == NULL ? -ENOMEM : 0;
+}
+
+static void ip6_frags_sysctl_unregister(void)
+{
+ unregister_net_sysctl_table(ip6_ctl_header);
+}
+#else
+static int ip6_frags_ns_sysctl_register(struct net *net)
+{
+ return 0;
+}
+
+static void ip6_frags_ns_sysctl_unregister(struct net *net)
+{
+}
+
+static int ip6_frags_sysctl_register(void)
+{
+ return 0;
+}
+
+static void ip6_frags_sysctl_unregister(void)
+{
+}
+#endif
+
+static int __net_init ipv6_frags_init_net(struct net *net)
+{
+ net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
+ net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
+ net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
+
+ inet_frags_init_net(&net->ipv6.frags);
+
+ return ip6_frags_ns_sysctl_register(net);
+}
+
+static void __net_exit ipv6_frags_exit_net(struct net *net)
+{
+ ip6_frags_ns_sysctl_unregister(net);
+ inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
+}
+
+static struct pernet_operations ip6_frags_ops = {
+ .init = ipv6_frags_init_net,
+ .exit = ipv6_frags_exit_net,
+};
+
+int __init ipv6_frag_init(void)
+{
+ int ret;
+
+ ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+ if (ret)
+ goto out;
+
+ ret = ip6_frags_sysctl_register();
+ if (ret)
+ goto err_sysctl;
+
+ ret = register_pernet_subsys(&ip6_frags_ops);
+ if (ret)
+ goto err_pernet;
+
+ ip6_frags.hashfn = ip6_hashfn;
+ ip6_frags.constructor = ip6_frag_init;
+ ip6_frags.destructor = NULL;
+ ip6_frags.skb_free = NULL;
+ ip6_frags.qsize = sizeof(struct frag_queue);
+ ip6_frags.match = ip6_frag_match;
+ ip6_frags.frag_expire = ip6_frag_expire;
+ ip6_frags.frags_cache_name = ip6_frag_cache_name;
+ ret = inet_frags_init(&ip6_frags);
+ if (ret)
+ goto err_pernet;
+out:
+ return ret;
+
+err_pernet:
+ ip6_frags_sysctl_unregister();
+err_sysctl:
+ inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+ goto out;
+}
+
+void ipv6_frag_exit(void)
+{
+ inet_frags_fini(&ip6_frags);
+ ip6_frags_sysctl_unregister();
+ unregister_pernet_subsys(&ip6_frags_ops);
+ inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+}
Code Review / kvmfornfv.git / blobdiff